Regensburg 2013 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 40: Poster Session Correlated Electrons
TT 40.47: Poster
Wednesday, March 13, 2013, 15:00–19:00, Poster D
Scanning Tunneling Spectroscopy at Surfaces of Superconducting Charge-Transfer Salts — •Sandra Diehl1,2,3, Torsten Methfessel2,3, Jens Müller2,4, Michael Lang2,4, and Hans-Joachim Elmers2,3 — 1Graduate School Materials Science in Mainz, 55099 Mainz — 2SFB/TR 49 — 3Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz — 4Physikalisches Institut, Goethe-Universität, 60438 Frankfurt am Main
Superconducting materials based on organic charge-transfer salts are regarded as candidates for unconventional superconductors because their properties strongly deviate from the BCS theory, similar to the high-temperature superconductors. We study κ-[ET]2Cu[N(CN)2]Br-crystals. Previous measurements showed a surface contamination of the crystals. Because of that we developed an in-situ cleaving mechanism for the preparation of clean surfaces. Measurements on these cleaved crystals show an improved signal-to-noise ratio in the measured I(U) spectra and atomic flat surfaces in the topographic images (nanometer scale in the height profile). All investigations were done under UHV-conditions (5 · 10−11 mbar) using a scanning tunneling microscope at 5 K.